Question

The mole drainage system is the most feasible in the fields with:

• A. Sandy soil
• B. Clayey soil
• C. Sandy loam soil
  (D) Sandy clay loam soil
• D.

Hint:

Think of mole drainage as burrowing a tunnel through the soil. This is only possible if the soil is like play-doh (clay), not like sand or loose dirt. The soil needs high clay content and structural stability.

Answer 1

The Correct Option is B

Step 1: Define mole drainage. Mole drainage is a method of subsurface drainage where an unlined, circular channel (a "mole") is formed in the subsoil by a special plough. There is no pipe installed; the system relies on the stability of the soil itself to keep the channel open.
Step 2: Determine the soil requirement for feasibility.
For the mole channel to remain stable and functional over time, the soil must be cohesive and resistant to collapse when wet.
- Sandy and loamy soils lack the required cohesion. A channel formed in these soils would collapse almost immediately.
- Clayey soils, especially those with a high clay content, are plastic and cohesive. When a mole plough passes through them, it smears and compacts the channel walls, creating a stable, semi-permanent drain. Therefore, mole drainage is only feasible in heavy, clayey soils.